What is the minimum amount of time that should be expected before clear signs of fitness improvement are seen in training? a. 2 weeks b. 4 weeks c. 6 weeks d. 8 weeks

How do nicotine and tobacco cause cancer? by decreasing blood-sugar levels by damaging or changing a cell's dna by increasing heart rate by increasing phlegm and mucous production

Blood cells bring oxygen to cells and take carbon dioxide away. true or false

Which is a personal reason for using tobacco